Microscopic Dynamics in a Strongly Interacting Bose-Einstein Condensate

Details Microscopic Dynamics in a Strongly Interacting Bose-Einstein Condensate Microscopic Dynamics in a Strongly Interacting Bose-Einstein Condensate

2002-01-22

arxiv.org/abs/cond-mat/0201400v3

Physics

Condensed Matter

Statistical Mechanics

4 pages in latex2E, 4 eps figures; revised Fig.1, revised scatt.lengths, added discussion, new refs., resubmitted to PRL

Scientific paper

10.1103/PhysRevLett.89.010401

An initially stable 85Rb Bose-Einstein condensate (BEC) was subjected to a carefully controlled magnetic field pulse in the vicinity of a Feshbach resonance. This pulse probed the strongly interacting regime for the condensate, with calculated values for the diluteness parameter (na^3) ranging from 0.01 to 0.5. The field pulse was observed to cause loss of atoms from the condensate on remarkably short time scales (>=10 microsec). The dependence of this loss on magnetic field pulse shape and amplitude was measured. For triangular pulses shorter than 1 ms, decreasing the pulse length actually increased the loss, until extremely short time scales (a few tens of microseconds) were reached. Such time scales and dependencies are very different from those expected in traditional condensate inelastic loss processes, suggesting the presence of new microscopic BEC physics.

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